package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;
    /**
     * 营业额统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO turnoverStatistics(LocalDate begin, LocalDate end) {

        //通过遍历begin到end获取dateList日期集合数据
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        List<Double> turnoverList = new ArrayList<>();
        //查询dateList每个日期对应的营业额，查询条件为开始时间 结束时间 订单状态为已完成(5)
        for (LocalDate date : dateList) {
            //将date格式转换成LocalDateTime
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //将查询条件封装到Map中
            Map map = new HashMap<>();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.getByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }

        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }

    /**
     * 用户统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO userStatistics(LocalDate begin, LocalDate end) {
        //统计日期集合
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //统计每天新增用户的集合
        List<Integer> newUserList = new ArrayList<>();
        //统计总用户量的集合
        List<Integer> totalUserList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date,LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date,LocalTime.MAX);
            Map map = new HashMap<>();
            map.put("end",endTime);
            totalUserList.add(userMapper.countByMap(map));
            map.put("begin",beginTime);
            newUserList.add(userMapper.countByMap(map));
        }
        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .build();
    }

    /**
     * 订单统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO ordersStatistics(LocalDate begin, LocalDate end) {
        //统计日期集合
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //每日订单数的集合
        List<Integer> orderCountList = new ArrayList<>();
        //每日有效订单数的集合
        List<Integer> validOrderCountList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date,LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date,LocalTime.MAX);
            orderCountList.add(getOrderCount(beginTime,endTime,null));
            validOrderCountList.add(getOrderCount(beginTime,endTime,Orders.COMPLETED));
        }
        //订单总数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        //有效订单总数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        //订单完成率
        Double orderCompletionRate = 0.0;
        if(totalOrderCount != 0){
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCompletionRate(orderCompletionRate)
                .orderCountList(StringUtils.join(orderCountList,","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .build();
    }

    /**
     * 根据指定时间范围查询销量排名
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO salesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin,LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end,LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime,endTime);
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names,",");

        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers,",");
        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 导出Excel报表
     * @param response
     * @return
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        //1.查询数据库
        //查询概览数据
        LocalDate beginTime = LocalDate.now().minusDays(30);
        LocalDate endTime = LocalDate.now().minusDays(1);
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(beginTime,LocalTime.MIN),LocalDateTime.of(endTime,LocalTime.MAX));
        //2.使用POI 向Excel写入数据
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
            XSSFWorkbook excel = new XSSFWorkbook(in);
            //设置居中
            XSSFCellStyle style = excel.createCellStyle();
            style.setAlignment(HorizontalAlignment.CENTER);
            style.setVerticalAlignment(VerticalAlignment.CENTER);
            //获取sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");
            //获取第二行
            XSSFRow row = sheet.getRow(1);
            row.getCell(1).setCellValue("时间:" + beginTime + "至" + endTime);
            row.getCell(1).setCellStyle(style);
            //获取第四行
            row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            //获取第五行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            //填充明细数据
            for (int i = 0; i < 30; i++) {
                //获取某一天
                LocalDate date = beginTime.plusDays(i);
                //查询这一天的数据
                businessDataVO =  workspaceService.getBusinessData(LocalDateTime.of(date,LocalTime.MIN),LocalDateTime.of(date,LocalTime.MAX));
                //获取某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessDataVO.getTurnover());
                row.getCell(3).setCellValue(businessDataVO.getValidOrderCount());
                row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessDataVO.getUnitPrice());
                row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            }

            //3.通过Excel流输出到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);
            //关闭资源
            out.close();
            excel.close();
            in.close();

        } catch (IOException e) {
            throw new RuntimeException(e);
        }



    }

    /**
     * 根据动态条件查询订单数量
     * @param begin
     * @param end
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime begin,LocalDateTime end,Integer status){
        Map map = new HashMap<>();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status",status);
        return orderMapper.countByMap(map);
    }
}
